18389942 has 4 divisors (see below), whose sum is σ = 27584916. Its totient is φ = 9194970.

The previous prime is 18389933. The next prime is 18389953. The reversal of 18389942 is 24998381.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24998381 = 17 ⋅1470493.

It is a junction number, because it is equal to n+sod(n) for n = 18389893 and 18389902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4597484 + ... + 4597487.

It is an arithmetic number, because the mean of its divisors is an integer number (6896229).

Almost surely, 2^18389942 is an apocalyptic number.

18389942 is a deficient number, since it is larger than the sum of its proper divisors (9194974).

18389942 is an equidigital number, since it uses as much as digits as its factorization.

18389942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9194973.

The product of its digits is 124416, while the sum is 44.

The square root of 18389942 is about 4288.3495659752. The cubic root of 18389942 is about 263.9531118902.

The spelling of 18389942 in words is "eighteen million, three hundred eighty-nine thousand, nine hundred forty-two".